Lifting device

Abstract

The invention discloses a lifting device suspended from a crane and comprised of a lifting beam, the shackle suspending devices mounted upon the lifting beam and movable therealong toward or away from each other depending upon the distance of attaching holes of the like of a load to be lifted, shackle devices each rotatably attached to the lower end of each suspending device and including means for adjusting the angular position of the shackle device and means for advancing a shackle pin into the attaching hole or retracting it therefrom.

What is claimed is: 
     
       1. A lifting device comprising a lifting beam, a pair of shackle suspending devices slidably mounted upon said lifting beam, means including a sprocket and driving chain for moving said suspending devices toward or away from each other, a shackle device including a shackle pin, means for attaching a shackle device to each of said suspending devices including a rotary pin, means for adjusting the angular position of each of said shackle devices, and means for advancing each shackle pin into an attaching hole of a block or retracting each shackle pin from said attaching hole. 
     
     
       2. A lifting device as set forth in claim 1 wherein said angular position adjusting means includes a chain wheel and a hand chain coaxially provided at one end of said rotary pin, and a disk securely and coaxially attached to the other end of the pin, said disk having a plurality of locking recesses formed in spaced apart relation around the periphery of the disk, and spring-pressed means engagable in said recesses to lock the rotation of said shackle device. 
     
     
       3. A lifting device comprising a lifting beam, a pair of shackle suspending devices movably mounted upon said lifting beam, means for moving said devices along said beam toward or away from each other, a shackle device carried by the lower end of each of said shackle suspending devices, means including a rotary pin carried by each suspending device for adjusting the angular position of each shackle device with respect to its associated suspending device, a shackle pin slidably carried by each shackle device, and means for advancing each shackle pin into an attaching hole of a load to be lifted or retracting said shackle pin from said attaching hole, each shackle device being in the form of a letter L and being rotatably carried at its midpoint by said rotary pin; and said angular position adjusting device comprising a counter weight attached to one end of said L-shaped shackle device remote from the end at which said shackle pin is mounted, and a wire rope attached to and suspended from said counter-weight.